Letters containing suspicious powder were mailed to multiple locations across the United States, including election offices, federal officials said.
Suspicious substances have been found in mail sent to media organizations, public and private polling companies, secretaries of state and related election offices, and various election-related entities, the Federal Bureau of Investigation (FBI) said in an alert on Friday.
The agency said it was investigating the incidents together with the United States Postal Inspection Service.
To date, no hazardous material has been identified, the FBI said, adding that law enforcement officials were working to intercept any further letters.
Staff in election offices in Oklahoma and Louisiana recently discovered suspicious powder in envelopes, triggering an evacuation of offices, the office of Connecticut Secretary of the State said last week….